正Ⅳ‡RS‑R

RADIOAC甘互Ⅴ亙SURVEY

BA

NUMB
NOV.

SurveyRadioactivity

DatinJapan

Nnmber33
Nov.1971

Contents

ExternalDose

Data

ExternalExposureduetoNaturaIRadiation(〃∂rわ〃∂//〃ざr/r〟ね扉舶dわ/og正∂/ぶc由〃Ce∫〉
DietalyData

Cesium･137inRice

Strontium･90and(〃∂わ〃∂//〃ざが餌拍扉月gr正〟/れ′帽/￡c由〃Ceぶ)
Strontium･90inWheat(〃∂如〃∂//〃ぶr/餌ねOr月gr/と〟/れ〟笥/ざc由〃Ceぶ)
DATA

OF

THE

TWELFTH

NUCLEAR

TEST

Meteoroto9はa=〕ata
GrossBeta･radioactivityinRainandDryFa"out(止p∂〃〝e托OrO/og正∂/月ge〃Cy‡
GrossBeta･radioactivityinUpperAir

OF

PEOPLE'SRE

Data

ExternalDoseExternaIExposureduetoNaturalRadiation(仙如〃∂//〃∫打出抒0′斤∂膚0/0如∂/立由〃Ceざ)A

fieId survey

radiation has

rates

of exposure

duetonaturaJ

been

Hoku･
conductedthroughtoutthe
districtriku
during May1970andOctoberofJapan19TO.

auxiliarydevices.ln13si

relationshipbetweenthel
PracticaIIy

Figurel.Distribution
districtsisindicatedin

ofobservedlocations
Figure2･Lneachlocation.fromonetofivesitescontainingat)east5

Were

Stations

reading

wereweretotalof83site
made there.A
measured.
Observationswere
made uslnga
SPhericalioniza一tion chamber
surveymeters.
and severalscinti]lation
ThesphericaIpJasticionizationchamberofwhichinner

SurVey.Thechamberapparatus,butitis

usedasstandard

ofdifficult to observe a[I]ocations

xl''scinti"atormeasurements.Twotypes

was

PrOPOrtion.SystematicE

error(random)

respectiveIywithin±6%

Within±3.5%(standarl
errorofthesurveymeterfor6pR/hr).

for

used
of surveymeters,theregularone

above

thegroul

exposurerates(pR/hr)uasterrestrialradiation,

thatthethe othera2''￠x2''Nal(Tl)scintillatorandWith a3′′￠x3′'Nal(Tl)scintillator,Were uSed as
Vdthrfrc

Measurementsinop

Onlybytheapparatus,SOthatasurveymeterwithaNaI(Tl)1''￠dire(thetoitCOrreSPOnding

meterand3mm(acrylate)hasadequatesensitivityforfieldathe

reducedintodiameterandwa)lthicknessarerespectiveIy200mm

wasuSedStationsandtheirreadin!

ThesituationoftheHokurikudistrictinJapanis
Showninin theWere

SurVeymeter

contributionof

WaSVerySLight.
Gamma･rayeXPOSurlin eachexposure

tocationareshoduetonatura[the Hokuriku

Tablel.Gamma･raVExt)OSureRatesduetoNaturaIRadiationi

districtiss

一丁 ExposureRate
ニ=二三Prefecture

Location‡て三三(〟R/hr)
7.8

三±‡三三±二幸

AC!D∈3

11.1

C,D18Niit訊ユ

12.4

C,D

19

Suibara

11.7

C,D

1lO

T餌gaWa

9.9

C,D

1ll

Kam0

10.7

C,D

112

Tsubame

11.5

C,D

113

Sanj0

11.6

C,D

114

Mitsuke

10.2

C!D

115Izumozaki

10.7

C,D

1

16

10.7

C,D

1

10.6

A,C,D

2

8.5

C,D

1Toqhio

17Nagaoka
18

Kashiwazaki
Arahama(11.0)

C200jiya

10.5

C

Dl21Koide

12.7

C

Dl19

Kashiwazaki

22

Shi02:aWa

7.8

CDl23

Tokamachi

6.9

CDl24

Matsudai

6.5

C

Dl25

Urakawara

12.5

C,D

26

こNaoetsu

8.7C,Dl
12

A,C,D

27

Takada

10.1

28

Arai

8.1

C!D

129Itoigawa

8.1

C,D

1

9.8

C,D

‑

1ユ.7C

D32

Uozu

1ロ.3

CDーーl31Kurobe‥‥̲̲｣一望̲竺竺享⊥l璽

33

Namerikawa

10.2

CDl34

Himi

8.4

C35

Shimminato

7亡3CToyama!3らTakaoka

三三‡二篭4(用｡S血iCC‑上D♪.p.ぷ[12‑ふ411

丁二三:.‥｡
Tsて十∴丹/a;ヰ1もu;uTl§42Wajirnali43UchitlralExposureRate

Prefecture
Fukui

Location(〃R/b)

Apparatus

54Fukui

10 755Katsuyama

12 031560no12 7

157Sabae

11 4

158Takefu

00

0

159T犯mga

19 4

1Myo】ln60T罰ユm9a1 ′b9

る1M肋ama

18 9Okuura

62Mihama
630bama
64Takahama
Jinno

65Takahama★

A‥

SphericalIonizationChamber

B:

Surveymeterwitha3′'￠x3′′NaI(Tl)

C:

Surveymeterwith2′′￠x2′′NaI(n)Scintillatorandarecorder
Scinti11atorandarecorder

D:Surveymeterwithl′′￠xl′′NaI(Tl)
Scintillator

TabIe2.PopulationExposureduetoNaturaIRadiation
ineachPrefectureoftheHokurikudistrict
byS.Abe.T.IdoandS.Hongo(〃∂血〃∂//〃∫〟加給0′β∂㌦8/og血∂/立由〃Ce∫)
ExposureRate±StandardDeviation
Prefecture

Niigata(〃R几r)
10.7±1.7

Popul(XIC
2,Figurel:TheSituationofHokuriku
DistrictinJapan

1400

Figure2

Distribu

1.Samboku
2.Murabmi
3.Shibata4.Niiga也
5.Maki6.Makib朗Ch
T.Shi10ne
8.Niitsu
9.Suibara
lO.Tsugawa
ll.Kamo12.Tsubame

13.飴njo
14.Mitsuke
15.lzumozaki
16.Tochio
17.Nagaoka
18.Kashi㈹詔l19.Kashiwaza1

20.Ojiya21.Koide
22.Shiozawa
23.Tokamachi

l…;::怨霊｡
ヽ‑26.Naoetsu

27.Takada
28.A【ai29.1t叩aWa
30.Oumi
31.Kurobe
32.Uozu
33.Namerikav1
34.Himi
35.Shimminat
36.Takaoka
37.Oyabe
3乱丁oYanⅦ
39.Johana
40.Hosoiri

I)ietaryI)ata

Strontium･90and

Cesium･137in

Rice(〟抽0/旧//〃∫打出ね0′月伊元〟他用/立由〃Cお)rice has beendetermined

Strontium･90contentin

TheattheNationa)InstituteofAgricultura]Sciencessince1957,andcesium･137contentinricesince1961.
AIIricesampIesareco"ectednationalandprefecturaIagrlCu[turalareasthroughtout
Japan.SampIinglocationsareshowninfigure4.
ThesampIesare

chosenasrepresentative

CuIturaJconditions.incIudingsoiltype.crop

anaI巾ica暮proced

describedonpa9e9,lssue

sentfrom

at.andfertiIizerapplicationandha

tion.
Theresu[tsobtainedfr
in table3and4.Theann

ofagrt･variety,andcesium･137contentsd
to1969isshowninfigure:Table3.90SrinRice‑1969to1970‑
byH.KobayashiandA.Tsumura(〟∂わ〃∂//脚血摘Ⅷ川伊血血肌/∫c由仰(ContinuedfromTabIe6.lssueNo.22.0‑1969‑
Month
Location

Sapporo,HOKKAIDO

Polished

harvested
October

gCa/Kg
0.047

Rice

pCi
1

Akita,AKITA

′l

0.040

2

Morioka,IWATE

JJ

0.053

00.0781

Mito,IBARAKI

September

0.057

0Konosu,SAITAMA

October

0.039

1

Sendai,MIYAGITachikawa,TOKYO
Kofu,YAMANASHI

September

0.063

10.0670ー1970‑
BrownLocation

Sapporo.HOKKAIDO

Riceharvested

gCa/KgSeptember

o.084

9.7

pCUKg

Akita,AKITA

=

0.135

17.0

Morioka,IWATE

=

0.121

12.4■

Sendai,MIYAGI

′′

0.109

8.6

Mito,IBARAKI

′′

0.100

5.6

0ctbber

o.135

8.1
11.0

Konosu,SAITAMA
Tachikawa,TOKYO‥

0.096

Kofu,YAMANASHI

′′

0.072

4.7

Takada,NIIGATA･′0.139

14.5

Kanazawa,ISHIKAWA

An卯St

Tsu,MIE

0ctober

Osaka,OSAKA

O･121

9･9

o.074

14.3

0.100

6.1

Okayama,OKAYAMA

November

O.113

4.7

Tottori,TOTTORI

0ctober

o.070

8.3

Tsukushino,FUKUOKA

November

o.111

8.2

O･1059･5′･

Averageforyear

95

Table4.137csin
Rice‑1969‑
byH.KobayashiandA.Tsumura(〟∂わ〃∂//〃∫〟餌ね0′A如C(ノ/れ〟笥/∫c由〃C･(ContinuedfromTable7.lssueNo.22.0
Locadon

Sapporo,HOKKAIDOMonthPolishedRice

harvested
αtober

gK/Kg

pCi

1.106

24

Akita,AKITA

Jl

0.993

3 2

Morioka,IWATE

J′

0.799

33

JJ

1.113

22J′

0.809

Sendai,MIYAGIKonosu,SAITAMA
Tachikawa,TOKYO
Kofu,YAMANASHI
Takada,NIIGATA

1.120

September
JJ

JJl

1.146
0.933lFigure3

Tempora=/ariationof90srand137csinRice‑‑19‑AllJapanMeanValues‑△137csinPolishedRice●9?srinBrown

09?srinPoIished

Rice01957

59616365

RiceFigure4:RiceSamplingLocation

1.蝕ppor0
2.Akit轟3.M01iob
4.Son血i
5.Mit08.Konosu
T.Tachikawa
8.Kotu9.Takさ血1G.K8naZ8Wall.Tsu12.Osaka
ほOk叩ama
14.Tottori
15.Tsukushino

〇.

1350

SEA

OFJAPANStrontium‑90inWheat(肋如〃∂//〃∫が打紐OfA伊元〟/れ〟笥/お由〃Ce∫)

Strontium‑90

contentin

wheat

has been

deter･

minedattheNationallnstituteofA9riculturalSciences
Since1957.Allwheatsamp]esarecoJlectedat,andsent
from nationalandprefecturalexperimenta]stations.
COVerlngallimportantareasofagrlCuIturethroughout
Japan.
Samplinglocations
are shownin
figure6.The=SamPIes

arechosen

asrepresentative of agrlCulturaI

COnditions.includingsoi11
applicationandharvesttiml
The analjticalmethoI
With that shown

on

pa9e

Publication.
TheanaIyticalresultsi
intable5.Theyearlyaver̀
during the period froml
figure5.

Table5,90srinWheat‑1969to1970‑
byH.KobayashiandA.Tsumura(〟∂わ〃∂//〃∫r/r〟reO′月gr血〟/れ〟笥/ざcfe〃(ContinuedfromTable8,]ssueNo.22,‑1969‑
Location

gCa/K｡｡Cj

Sapporo,HOKKAIDO

h慧霊d
Au9uSt0.315

2Akita,AKITA

July

0.372

50.33130.33110.30130.37820.325

1

Morioka,IWATE
Iwarruma,MIYAGI

IJ

June

Nagaoka,NIIGATA
Mito,IBARAKI

Kitamoto.SAITAMA′′JulyJ′

Table5.90srinWheat‑1970‑

Location

農;覧dgCa/Kg

pCi/

July

0.410

24

Morioka,IWATE

JJ

0.211

18

Iwanuma,MIYAGI

IJ

0.211

11

Nagaoka,NIIGATA

JI

0.278

370.28122

Sapporo,HOKKAIDO

June

Mito,IBARAKI

Kitamoto,SAITAMA

lJ

0.261

16

Tachikawa,TOKYO

IJ

0.378

39Kofu,YAMANASHI

′J

0.221

13ll

0.271

310.361

300.325

29O･292

25･Osaka,OSAKA
Okayama,OKAYAMA

JJ

Ama由,FUKUOKA

IJ

Averageforyear

Figure5:TemporafVariationof90srinWheat‑1957to1970‑‑AIIJapanMeanValues‑200Fig.6:WheatSamplingLocation

1.S叩POrO
2.Akita
3.Morioka
4.lwanuma
5.仙卿血
6.MitoT.Kitamot0
8.T那加眈帥帽
9.KofulO.0矧bll.Okayama
12.Am叩l

1350

SEA

OFJAPAhl

DATA

OF

THE

TWE

NUCLEAROF

THE

PEOPLFSTESTREPUBLIC

MeteorologicalData
GrossBeta･radioactivityinRainandDryFa"out(通関〃ル短お0′0/0如∂/月㌍〃Cy)
Surveyofgrossbeta･aCtivityinrainanddryfa"outhasbeenconducteduslngthedatafrom13stationsof

lyobservedatAkitaLot

JapanMeteorologLCalA9enCyShowninFigure7.

Atanotherstationsreco

Theproceduresofsamplingandcountingaresame
asthosediscribedonpage20fthereportNo.50fthis

theresultareshownint
Ltis estimatedfrorT

Publicationseries.
The12thnucleartestofthePeople'sRepublicof

inFigure8thattherad

China山as(300mb]evel)overthe

carried out

on18November.1971.1tis
believedthatthetestareaistheneighborhoodofLake

LopNor(400N,900E),about4000kmwest･nOrthwest
date of gross beta‑radioactivity for
Of Tokyo.The
19･30November.1971isshownintabIe6and7.
Abnorma[microbarographicdisturbancewasfaint‑

tropospherefirstpassed
hoursaftertheexplosioJ
The

radioactivityneartheground)durin!
Showedsignificantdepa
tions.

Table6.Grossbeta･aCtivityinRain,Nov.20‑30.1971
CompiledbyN･Banno,T･Honda.H･Ueno(J叩∂〃〝e加ro/og血∂川g即Cγ)
Upperrow:Concentration(pCi/cc)
Lowerrow:Deposition(mCi/km2)
Nov.1971
202122

23

0.1

0.1

0.8

0.1

0 00 0
̲

●

001

040●

●

l●

l■

0 0
■

0 0
■

00

●

一0

一040

●

0 10 5●300〇.L一2●

̲●一一400 253 02 0■

0 52 02 0■

■

●

10■

2626●

●

●

3 9 0●

■

360
29

●0●

■

1 5■

00
55

13 92

●

L6.〇.〇.

10.0〇.2.

0.0

2 9一l̲

1000

70

●

7,0

7.4.

1q一●

●

00 0
■

Table7.Grossbeta･aCtivityinDust,Nov.19‑30,1971
CompiIedbyN.Banno.T.Honda,H.Ueno(止卵〃〃efeoハワ/og血∂川卵〃Cy)(pCi/m3)

Table8

TheMicrobarographicDisturbanceduetothe12t
NuclearTestofThePeople'sRepublicofChina,
Nov.18.1971.
CompiledbyN.Banno,T.Honda.H.Ueno

伍卵〃〃efeoro/og血∂川卵〃Cy)
TimeStation

Wakkanai(45025′N14lO41′E)

Ku血むo(42059′N144024′E)

Akita(39043′N140006′E)

Wajima(37023′N136054′E)

Tokyo(35041′N139046′E)

Yona90(35026′N133021′E】

Murotomisaki(33015′N134011′E)

Ka90血ima(3lO34′N130033′E)

(mb)

09:46

ウ

Recordswereobscure.
?:Amplitude(G.M.T.)

Notdeterminedbecausethechangewastoosma11.

Period

(min)

1400

Fig.7:FalIoutObservationNetworkofJapan
MeteorologJCaIAgency㊥馳sicS伽tion(R扇n川dDustI
OSu剛血l㈹nt8叩S伽tion(R扇n)GrossBata･radioactivityinUpperAir(伽∫e∂化わ∂〃dβeve/叩me〃r〟.0りJ邸招〃伽ね〃ざe月卵〃Cy)

AgencyH.n..
and Development
hasmeasuredthebeta‑aCtivity

thelowerIaverof the stratosphere

Since1960.Research
DefenseJapanofdustin

andmadeusln9tWOaircraftat･
made a normaIsampLing
downwardfIi(upwardand

tropopauseusIn9aircraftascoIIectors･
ThesamplesweretakenoverthreeareasofJapanthe amounts

dustsamplesattachedaltitude.

ustn9boththeundertheaircraftof radioactivi

aircraftis taken

Figure9showsthreesz

vdn騨and9ummed
The

papersattachedinfrontofthem･with gummed
paperssampIin9flight

twoResu]tsobtainedissho

wereTable9.Grossβ･aCtibityinUpperAir‑Nov.19thto25th,1971‑
byK.Kenmochi,T.Akimoto,T.MatsumuraandK.Kit(伽∫e∂化わ∂〃d伽ye/叩me〃r〃.ロリ々p∂〃伽/如館月卵〃(

CentralArea

NorthernArea

COntentS

FrightArea

AltitudeIntensity(ft)

Nov.19th18:00

FrightAltitude

Intensity

Area

(餌)

Iruma

37.0003.2

37.0001.2

30.000

0.4

‥

0.4

Sado

WajimaHachinohe
Niigata

37,000

1.8

=1.8

Iruma

Hachinohe
20th

OO:00
01:00

′′

02:00
03:00
04:00
05:00
09:00

‥

30,000′′

=0.6
1.0C

Figure9:

ThreeSamp=ngAreasofJapan
1400‥‥‑･‑･･FljghtTrack